Plastic bag opener



FIG. 1 is a side elevational view of a plastic bag opener showing my new design, the opposite side being a mirror image thereof;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof; and

FIG. 4 is a rear elevational view thereof. 

The ornamental design for a plastic bag opener, substantially as shown and described. 